Grinding-machine



2 Sheets-Shet 2.

(No Model.)

8.8018881388. GRINDING MAGHINB.

N8. 404,886. PatentedJune 4, 1889.

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UNITED STATES PATENT OFFICE.v

RUDOLPH CONRADER, OF ERIE, PENNSYLVANIA.

GRINDING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 404,686, dated June 4, 1889.

Application filed August 13, 1888.

.To all whom it may concern:

Be it known that I, RUDOLPH CONRADER, a citizen of the United States, residing at Erie, in the county of Erie and State of Pennsylvania, have invented certain new and useful Improvements in Grinding-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompany.- ing drawings, and to the letters of-reference marked thereon, forming part of this specification.

My invention consists in the improvements in grinding-machines, hereinafter set forth and explained, and illustrated in the accompanying drawings, in which.-

Figure l is a perspective View of my machine, seen from the rear. Fig. 2 is a top or plan View of same. Fig. 3 is a cross-section of same on line x fc in Figs. l and 2.

Like letters refer to like parts in all of the figures.

In the construction of my machine shown the frame consists of the bed A, supported `upon legs B B, the frame A being provided with ways a, a, similar to an ordinary latheframe. Upon each end of the frame A, I secure h ead-blocks C and C',which are supported upon gibbed plates D D', resting upon the Ways a a, so that the head-blocks C and C' may be moved crosswise upon the plates D D', as and for the purpose hereinafter set forth. In bearings d d in the head-blocks C and C', I mount the journals c of an oscillating bellcrank shaft E, which extends along the back of the bed A from one head-block C tothe other C'.

Centrally upon the shaft E, I secure a circular horizontal plate F, and upon this plate a plate G, adapted to be rotated thereon and to be secured at any desired point by means of bolts passing through slots f in one of these plates, and to the upper plate G,I secure. a rectangular plate H, the edges h of which form gibbed ways for the traverse of the bed-plate I of the grinding-carriage J ,which rests thereon, the plate I being also gibbed crosswise, so that the grinding-carriage J may be adjusted in and out thereon by means of a set-screw t' Serial No. 282,606. (No model.)

therein. In the carriageJ is mounted an emery-wheel K, driven by a belt kfrom an overhead drum, (not shown,) in the usual manner.

,Alon g the rear of the bed A, below the shaft E, I mount a shaft L in bearings?) on the bed A, and I secure to the shaft L, directly below the plate F on the shaft E, a crank-disk M, having an adjustable wristfpin m therein, whereby the length of the stroke of the crank can be varied at pleasure, and from the wristpin m, I extend an adjustable connecting-rod N to a bearing n on the under side of the plate F, so that the crank M operates to oscillate the shaft E and the grinding mechanism hereinafter described, mounted thereon and supported thereby, the shaft L being driven by a belt, in the usual manner. t

To the inner edge of the grinder-carriage bed-plate I, I secure an arm e, at the outer end of which is a flexible joint g, from which a rod Z extends to and through a bearing j in the feed-nut O, which is operated by an ordinary feed-screw P, so that the motion of the feednut O is communicated to the grinding-carriage J through the rod Z and arm e, the carriage J being thereby moved longitudinally on the plate II to enable the grinding-wheel K to traverse the length of the work required.

On the bed A, betweenthe heads C and C',-

I secure adjustable-tail-stocks Q Q', between which the Work to be ground is centered and secured. To the front side of the bed A, opposite the head C', I secure brackets R R', in which is mounted a shaft S, provided With a reversing-clutch T and pulleys r r', which shaft is geared to the feed-screw P by gearing o p, in the usual manner, so that the feedscrew P may be run forward or backward,'as desired. In operating this machinea taper ream er U (or other piece of work) to be ground is placed between the center of the tail-stocks Q Q'. The head-blocks C C' are then adjusted across the bed A on theirbed-plates D D', so as to give the grinding-wheel K the proper radial movement, and the plate His adjusted by means of its circular bearings G on the plate F, so that the angle of the traverse of the grinder-carriage J thereon will correspond with the taper of the reamer U. The machine is then started, the shaft L and its crank mechanism operating to oscillate the shaft E IOO and grinder-earriage J thereon, so as to preserve the radial contour of' the work being ground, while the feed-screw operates the nut O, and thereby the grindeikcarriage J, and

causes it to travel back and forth along the work until completed.

I have thus described convenient mechanism for utilizing my invention so as to enable others to construct and operate the same; but it is obvious that many modifications may be made therein without departing from the spirit of my invention. Therefore,

What I claim as new, and desire to secure by Letters Patent of the United States, is

l. The combination, in a grinding-1naehine, of a grinding-carriage supported by and traveling on an oscillating supporting-bed, with a traveling feed-nut, a feed-screw operating said nut, and a iiexible connection betweenl said grinder-carriage and said feedmut, substantially as and for the purpose set forth.

2. The coinbinatiomin a grinding-1naehine, of adjustable head-blocks on the machineframe, an oscillating bell-crank shaft mounted in said head-blocks, and an adjustable traveling grinder-carriage mounted on said shaft and supported thereby,with a shaft and crank mechanism connecting with and operating said oscillating` shaft, substantially as and for the purpose set forth.

3. The combination, in a grindingunachine, of adjustable tail-blocks mounted on ways on the 1naehinefrau1e and adapted to support work to be ground, with a grinderframe mounted upon an oscillating bell-crank shaft adapted to be moved in and out to and from the work to be ground, said grinder-frame being adapted to travel laterally along said work on an adjustable bed secured to said oscillating bell-crank shaft, substantially as and for the purpose set forth.

4. The combination, in a grinding-machine, of a grinder-carriage traveling on an adjustable bed mounted upon a laterally-adj ustable oscillating bell-crank shaft, with a flexible arm connecting' said carriage with afeed-n ut, and a reversible feed-screw operating said feednut, substantially as and for the purpose set forth.

The combination, in a grinding-machine, of the heads C C', adapted to be adjusted across the bed A, and the oscillatingbell-crank shaft E, mounted thereon,with the adjustable bed Il, mounted on the shaft E, the grindercarriage J, a rotary grinder K on said carriage J and traveling on said bed II, the crank M, connected to and operating to oseillate the shaft E and the grinder mechanism mounted thereon, and the reversible feed-screw P, nut O, and jointed arm Z e, connecting said nut with t-he grinder-carriage J, substantially as and for the purpose set forth.

In testimony whereof I aflix my signature in presence of two witnesses.

RUDOLPH CONRADER. lVitnesses:

lVILLLiM WALLA( an, II. J. (lun'rzn. 

